Function isRemoteHTTPArchive

internal/plugin/installer/installer.go:182–216

isRemoteHTTPArchive checks if the source is a http/https url and is an archive It works by checking whether the source looks like a URL and, if it does, running a HEAD operation to see if the remote resource is a file that we understand.

(source string)

// It works by checking whether the source looks like a URL and, if it does, running a
// HEAD operation to see if the remote resource is a file that we understand.
func isRemoteHTTPArchive(source string) bool {
	if strings.HasPrefix(source, "http://") || strings.HasPrefix(source, "https://") {
		// First, check if the URL ends with a known archive suffix
		// This is more reliable than content-type detection
		for suffix := range Extractors {
			if strings.HasSuffix(source, suffix) {
				return true
			}
		}

		// If no suffix match, try HEAD request to check content type
		res, err := http.Head(source)
		if err != nil {
			// If we get an error at the network layer, we can't install it. So
			// we return false.
			return false
		}

		// Next, we look for the content type or content disposition headers to see
		// if they have matching extractors.
		contentType := res.Header.Get("content-type")
		foundSuffix, ok := mediaTypeToExtension(contentType)
		if !ok {
			// Media type not recognized
			return false
		}

		for suffix := range Extractors {
			if strings.HasSuffix(foundSuffix, suffix) {
				return true
			}
		}
	}
	return false
}

// isPlugin checks if the directory contains a plugin.yaml file.
func isPlugin(dirname string) bool {